Dev branch, create tests to ensure changes don't break, github actions to merge dev on main of tests pass

[bar-alex]

• create dev branch so all your changes go to dev branch
• create tests (Jest) to make sure whatever changes you make don't break existent functionality
• create github actions to automatically merge dev to branch on push to dev, if the tests pass (get inspiration from michael's repo)
• find more info online about this workflow, maybe there's something better ?!